Mr. Li lent me a book last week, _____I have learned a lot about earthquakes.
| A．to which | B．for which | C．from which | D．with which |
____ hard you try, it is difficult to lose weight without cutting down the amount you eat.
| A．However | B．Whatever | C．Whichever | D．Whenever |
（2012江苏卷）One's life has value one brings value to the life of others.
| A．so that | B．no matter how | C．as long as | D．except that |
I think Tom, as the head of a big department, should either study regularly or ________ his job.
| A．quits | B．to quit | C．quitting | D．quit |
Mike was usually so careful, ________ this time he made a small mistake.
| A．yet | B．still | C．even | D．thus |
At school, some students are active ________some are shy, yet they can be good friends with one another.
| A．while | B．although |
| C．so | D．as |